Nothing is wrong with the car. Fans want something revolutionary and for it to be seen as a 'sign' that they could be heading in the right direction and making a massive jump - as always F1 fans as fickle when it comes to the looks or when testing times don't meet their expectations. Wait until the first race.
The Baku upgrade is no different to past seasons for a long time when teams used to leave their first big development upgrade when races moved back to Europe. This is no different except now you have to be more careful in your development plan with the budget cap in place.